Authors: Pogorzelski S.J., Kogut A.D.

Title: Static and dynamic properties of surfactant films on natural waters

Source: Oceanologia
year: 2001, vol: 43, number: 2, pages: 223-246
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Keywords: MARINE FILM, ISOTHERM, VIRIAL EQUATION, ADSORPTION KINETICS, RELAXATION PROCESS, VISCOELASTICITY

Discipline: AQUATIC SCIENCES

Language: ENGLISH

Document type: ARTICLE

Publication order reference:
S.J. Pogorzelski, Institute of Experimental Physics, University of Gdansk, Wita Stwosza 57, 80-952 Gdansk, Poland, e-mail: fizsp@univ.gda.pl

Abstract: The paper contains the results of natural surface film surface pressure - area experiments carried out in inland waters and shallow offshore regions of the Baltic and Mediterranean Seas during 1990-99 under calm water conditions using the Langmuir trough - Wilhelmy filter paper plate system, which `cuts out' an undisturbed film-covered sea area without any initial physico-chemical sample processing. The limiting specific area A lim and mean molecular mass (0.65-9.7 kDa) of microlayersurfactants were determined from the 2D virial equation of state applied to the isotherms. Film structure signatures were derived from pi - A isotherm hysteresis and application of the 2D polymer scaling theory. The stress-relaxation measurements revealed a two-step relaxation process at the interface with characteristic times gamma1 (1.1-2.8) and gamma2 (5.6-25.6) seconds suggesting the presence of diffusion-controlled and structural organization relaxation phenomena. The results demonstrate that natural films are a complex mixture of biomolecules covering a wide range of solubilities, surface activity and molecular mass with an apparent structural organization exhibiting a spatial and temporal variability.

Other author's publications:
A.D. Kogut,
S. J. Pogorzelski,
S.J. Pogorzelski,